如何在PHP代码中引入JavaScript警报窗口

Question

我需要show_alert()在PHP代码中引入JavaScript警报功能.怎么做到这一点？

script type="text/javascript">
        function show_alert() {
            var msg = "No solution found.";
            alert(msg);
        }
</script>
<?php
//...
    $outputs = -1;
    if ($outputs == -1) {
        echo '<script type="text/javascript"> show_alert(); </script>';
    } else {
        ?>
        <table width="100%">
            <tr>
                <td width="100%"> 
                    <div class="scrollbar" id="chart">
                        <img src="ganttchart.php">
                    </div>
                </td>
            </tr>
        </table>
    <?php
    }
?>

Answer 1

内嵌JavaScript需要在内部<script>标记中.只需在有效的地方输出它们.请注意,尽管如此,您不能以这种方式影响PHP代码的操作.

Answer 2

试试这个,它回显show_alert(); 在PHP中:

<script type="text/javascript">
    function show_alert() {
    var msg = "No solution found";
    alert(msg);
    }
</script>

<?php
//...

$output = run_function();
if ($output == -1) {
   echo '<script type="text/javascript"> show_alert(); </script>';
}
?>